Safety device for bolt-heading machines.



No. 648,382. Patented May I, I900.

J. n. BLAKESLEE. SAFETY DEVIGEFOR BOLT READING MACHINES.

. (Applicbioli filed. June 12, 1899.)

(No Model.) I

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NITED STATES PATENT OFFICE.

JOHN R. BLAKESLEE, OF CLEVELAND, OHIO.

SPECIFICATION forming part of Letters Patent No. 648,382, dated May 1, 1900.

Application filed June 12, 1899. Serial No. 720,322. (No model.)

To all whom it may concern.-

Be it known that I, J OHN R. BLAKESLEE, a

citizen of the United States of America, and a resident of Cleveland, in the county of Guyahoga, State of Ohio, have invented certain new and useful Improvements in Safety Devices for Bolt-Heading Machines, of which the following is a specification.

This invention relates to a safety device for bolt-heading machines; and it consists of a new construction and adaptation of a safetypitman connecting the crank-operatin g shaft with the gripping-die mechanism.

The object of the invention is to provide against the danger of breakage or damage to the machinery by reason of the displacement of a blank or the accidental falling of any other object between the gripping-dies.

The nature and operations of this invention will fully appear from the subjoined description and are illustrated in the accompanying drawings, in which- Figure l is a top or "plan view of a bolt heading machine having my new safety-pitman attached. Fig. 2 is a side elevation of the same. Fig. 3 is an enlarged sectional view of the new pitman.

Like letters of reference indicate like parts throughout the several views.

A represents the bed and supporting-frame for the operating mechanisms of the machine.

A A are the ways or slides for the movable die-holding heads.

Bis a chambered projection on the bed A, in which is supported the knuckle-joint mechanism which operates the movable grippingdies.

0 is one of the members of the joint, consisting of a hollow or tubular post 0, having arms 0 O. This member is supported on a pin or bolt D, passing through said post and fixed in the rounded portion of said chamber.

E is a link connecting the arm with the movable die-head E. The arm 0 contains a ball-joint socket for connection with the rod F, comprising part of the new pitman.

G is a ball on the end of the rod F, which is held in the socket by the cap G, secured by the screws g.

This description forms part of the mechanism contained in my application, Serial No. 697,582, filed November 28, 1898, and does not form a part of the improvement for which a patent is asked in this application, but is introduced'to show the connection of this new improvement with the same.

This new improvement consists in the peculiar construction of the pitman which operates in conjunction with the said knucklejoint, whereby the safety device is self-operating and self-setting for continued and uninterrupted operations of the machine. This pitman consists of a hollow portion H, having an eye H, which connects it with the crank K on the driving-shaft I. J J are two transverse chambers made one on the upper and one on the under side of said pitman and about midway of its length. Said transverse chambers are covered and closed by chainbered caps M M, secured by bolts m m. The rod F is inserted in the open end of the pitman and is held therein by a ring and sleeve H, secured by screws f f.

N is a fiat bar secured in the head of the rod F and has its opposite end corners beveled off at an angle of about forty-five degrees.

O O are rollers j ournaled in the blocks P P, contained in the transverse chambers J J. The rollers bear against the beveled corners of the said bar N.

R R arepins or lugs on the blocks P P, and S S are springs placed on said pins and hearing against the blocks and the caps M M. The tension of said springs is great enough to offer sufficient resistance against the bar N to operate and hold the gripping-dies, but will yield against any undue pressure,as when any obstruction intervenes betweenthe gripping-dies.

From the foregoing it will be seen that the workings and advantages of this improvement are that all liability to injury to the machine by reason of obstructions in the dies is obviated. A small obstruction will cause the springs to spread by a little movement of the bar. A large obstruction does not spread the springs any farther; butthe bar is pushed in between the rollers, allowing the pitman to complete its stroke without operating the dies. Then when the pitman makes the returning part of its stroke the bar is withdrawn and the pressure of the springs resets the blocks and rollers against the end of the bar. Thus rollers O O, and supported in the transverse chambers J J of said hollow pitman, the arrangement being such that said blocks will spread against undue pressure from said bar N, as and for vthe purpose specified. V 2. In a machine for heading bolts, provided with heading and gripping-die mechanisms, the combination with the driving crank-shaf t; of the pitman consisting of the hollow part H, having the transverse chambers J J, caps M M closing said chambers, blocks P P supported in said chambers, and provided with the rollers O O, springs S S in the caps M M and bearing against said blocks, the rod F held in the end of pitman.H, and connected with the gripping-die-operating mech anism, and the bar N attached to the rod F and having the beveled corners bearing against the rollers O O, and adapted to spread said blocks against'undue pressure, and to reset them by withdrawal by the return halfstroke of the pitman,substantially as and for the purpose set fort Signed by me at Cleveland, Ohio, this 8th 1 day of June, 1899.

- JOHN R. BLAKESLEE,

Witnesses:

' GEO. W. TIBBIT-TS,

M. MILLARD. 

